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On the set QQ^(+) of all positive ration...

On the set `QQ^(+)` of all positive rational numbers if the binary operation `**` is defined by `a**b=(1)/(4)ab` for all `a,binQQ^(+)`, find the identity element in `QQ^(+)`. Also prove that any element in `QQ^(+)` is invertible.

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